2-Hbaot: an excellent resin adsorbent for cadmium abetment from contaminated water

Out of known 104 naturally occurring elements some are very useful, rather essential for human life, while a few others inclusive of cadmium are toxic and dangerous. Cadmium is mainly used in the industries for coating steel, glass, plastics etc. and also for the production of Ni-Cd battery and automotive tyres. Cadmium is much dangerous due to its long half life and it can exert toxic effects on almost all systems of the human body. The intake of cadmium depends on its concentration in natural sources such as air, land and water and should not exceed 20 mg per day. Cadmium would also be shown to be associated with occurrence of Itai-Itai, a kind of disease, under which patient shows a wide range of symptoms such as low grade of bone mineralization, high rate of fractures, increase rate of asteoporosis and intense bone associated pain. In the present investigation, attempt has been made to study the applicability of Terpolymer Resin derived from 2-Hydroxybenzaldehyde (2-HBA), Oxamide (O) and Trioxane (T) as a potential metal adsorbent to remove Cadmium from aqueous solution (contaminated water). A direct proportionality between the percentage of divalent Cadmium removal and adsorbent doses was noted. Maximum removal of Cd(II) was achieved at pH ranges of 6.5 – 9 for this adsorbent. The optimum temperature of 308 K for efficient removal of Cd (II) was observed. The effect of anions like SO42-, Cl-, NO3- and ClO4- on divalent Cadmium adsorption has also been investigated. The adsorption isotherm data have been confirmed to Freundlich and Langmuir isotherms. Kinetic studies indicated pseudo second order kinetics. Thus the terpolymer resin (2-HBAOT) under present investigation is found to be successful for the removal of toxic Cadmium from aqueous solution (contaminated water).